FradX.mat
- FradX.xData --- vector of fast-axis coordinate of measured force (um)
- FradX.FradData --- 11x2 array of focal-plane force (col. 1) and errorbar value (col. 2) at each fast-axis position (pN)
- FradX.xFit --- fast axis for Frad(x) fit (um)
- FradX.FradFit --- fit Frad(x) profile (1 Gaussian)

FradZ.mat --- median Frad vs. z from all beads with curve-fit
- FradZ.zData --- vector of depth coordinate of measured force (um)
- FradZ.FradData --- vector of measured lightsheet-center force (pN)
- FradZ.zFit --- depth axis for Frad(z) fit (um)
- FradZ.FradFit --- fit Frad(z) profile (sum of 3 Gaussians + DC offset)

FradZcenter.mat --- raw Frad vs. z of individual beads with median and MAD
- FradZcenter.zData --- vector of depth coordinate of measured force (um)
- FradZcenter.FradData --- vector of measured lightsheet-center force (pN)
- FradZcenter.zMedian --- depth axis for median measured force (um)
- FradZcenter.FradMedian --- 2501x2 array of median (col. 1) and median absolute difference (col. 2) of measured force